If you think your regular Tabata routine is too easy – you can always modify it by adding more rounds and doing a second set right after the first.
Here’s an uncut video of Jason Yun doing two 12 round (instead of 8 ) Tabata interval sessions back to back with a 2 minute rest between sets.
In the first modified Tabata set (12 rounds), he’s doing Pushups, Squat jumps, Speed Rows and Monkey Jumps. So you will end up doing 3 rounds of each exercise.
The second set consists of Hindu Pushups, Super Lunges, Diamond Cutters, and Burps.
These are all body weight exercises and no equipment required aside from a good Tabata Timer. Check it out: